Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts

Parvez, Khaled; Wu, Zhong‐Shuai; Li, Rongjin; Liu, Xianjie; Graf, Robert; Feng, Xinliang; Müllen, Kläus

doi:10.1021/ja5017156

Cited by 1,239 publications

(1,101 citation statements)

References 43 publications

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“…11 Such nanosheets generally consist of ~1-10 stacked monolayers and are usually prepared by liquid-based exfoliation or synthesis techniques. 9,[12][13][14] Such production methods are important, as the availability of nanosheets dispersed in a liquid allows the production of the films and coatings which are required for many energy-related applications.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

et al. 2016

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Although many electrochemical properties of 2D materials depend sensitively on the nanosheet dimensions, there are no systematic, quantitative studies which analyse the effect of nanosheet size and thickness on electrochemical parameters. Here we use size-selected WS2 nanosheets as a model system to determine the effect of nanosheet dimensions in two representative areas -hydrogen evolution electrocatalytic electrodes and electrochemical double layer capacitor electrodes. We chose these applications as they depend on the interaction of ions with the nanosheet edge and basal plane, respectively, and so would be expected to be nanosheet-size-dependent. The data shows the catalytic current density to scale inversely with mean nanosheet length while the volumetric double layer capacitance scales inversely with mean nanosheet thickness. Both of these results are consistent with simple models allowing use to extract intrinsic quantities, namely the turnover frequency and the double layer thickness respectively.3

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Section: Introductionmentioning

confidence: 99%

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

et al. 2016

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“…As the SO 4 2-and H 2 O tend to enter the graphite layer [27] , the anode graphite begins to dissociate into electrolyte. In this process, we believe that the reduction of SO 4 2-anions and the autoxidation of H 2 O produce gaseous substances such as SO 2 , O 2 , etc., these gases can exert greater force in the graphite layer and separate the graphite layer with weak combination [28] , and ultimately form weak graphene bonding stripping graphite layer.…”

Section: Resultsmentioning

confidence: 99%

“…In this paper, the method of preparing graphene is improved based on the existing preparation methods [27] [28] . In short, it is to use two graphite rods to form a dual electrode system routine, the electrolyte is 0.1M (NH4) 2SO4 Research,volume 123 solution, the distance between the electrode should maintain about 30mm, and then through the preparation of graphene by chemical stripping at a constant voltage of 10V, after the graphite peeling is completed, the obtained graphene product is dried up.…”

Section: Preparation Of Graphenementioning

confidence: 99%

Preparation of super hydrophobic coating for insulator against icing flashover

Yao¹

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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the insulator is a kind of important electric components, because it plays a role in electrical insulation and plays a supporting role in mechanical, power system and even the development of the whole society to a higher degree of dependence on the performance of insulators, the requirements are also rising. However, in recent years, China's domestic air pollution is serious, the weather conditions are complex, the icing flashover phenomenon has become a serious performance of insulator safety accidents. However, the proposed super hydrophobic materials in this paper, not only the anti icing flashover performance is better than the commonly used coating, and preparation process is sample, high performance, and low cost, which is expected to become a substitute for insulator coating now.the super hydrophobic coating is considered to be one of the important methods to solve the problem of flashover electrical equipment, so the study of high hydrophobicity flashover, super hydrophobic coating with high performance, simple process, low cost plays an important role in electrical equipment and power industry. In this paper, we will use a kind of method which is more powerful, graphene was prepared by electrochemical stripping and poly-two methyl siloxane in a certain proportion to prepare superhydrophobic surface. In this paper, the preparation of superhydrophobic surface, not only has excellent self-cleaning performance, but also has a very low corrosion current density. It is surprising that the superhydrophobic surface prepared by this method has good mechanical stability, and its surface can maintain the super hydrophobicity after the strong impact of the outside world. The method mentioned in this paper is not only capable of preparing a set of super hydrophobic surface self cleaning,mechanical stability is stable as a whole, it also provides a new idea for anti icing flashover of electrical equipment.Key words: Superhydrophobic Coating; Graphene; Insulator; Corrosion; Resistance IntroductionWith the development of the electric power industry and the gradual improvement of the voltage level, the electrical equipment is playing a more and more important role in people's daily production and life. Of which the insulator is an important part of power system, however, the phenomenon of icing flashover has a great influence on the mechanical and electrical properties of insulators, which will threaten the stability and security of power system operation, resulting in huge economic losses. Take snow disaster in South China in 2008 as an example, the ice coating accidents spread to 13 provinces, State Grid economic losses in the accident up to 10 billion 450 million Yuan, and in daily life, line trip, outage accidents also occur caused by icing [1] , it causes a great impact on people's life. Therefore, it has become one of the most urgent problems to solve the problem of icing flashover. However, there are still a lot of defects in the deicing and anti icing methods currently used, and the efficiency is low a...

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“…For example, the exfoliation efficiency of graphene nanosheets was improved (e.g., yield >85%; ≤3 layers; lateral size ∼44 μm) using aqueous solutions of (NH 4 ) 2 SO 4 , Na 2 SO 4 , and K 2 SO 4 and exhibiting hole mobility ∼310 cm 2 /Vs. Highly conducting films were brush coated on paper from a graphene ink for fabricating all-solid-state flexible supercapacitors delivering a high area capacitance of 11.3 mF/cm 2 [306].…”

Section: Materials Productionmentioning

confidence: 99%

Green Intelligent Nanomaterials by Design (Using Nanoparticulate/2D-Materials Building Blocks) Current Developments and Future Trends

Kumar¹,

Ahmad²

2017

Nanoscaled Films and Layers

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Feasibility of designing and synthesizing 'smart' and 'intelligent' materials using nanostructured building blocks has been examined here based on the current status of the progress made in this context. The added advantages of using 2D layered/nonlayered materials along with phytosomal species derived from natural plants are highlighted with special reference to their better programmability along with minimum toxicity in biomedical applications. The current developments taking place in their upscaled productions are also included while assessing their upcoming industrial usages in diverse fields.

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Exfoliation of Graphite into Graphene in Aqueous Solutions of Inorganic Salts

Cited by 1,239 publications

References 43 publications

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

Electrochemical Applications of Two-Dimensional Nanosheets: The Effect of Nanosheet Length and Thickness

Preparation of super hydrophobic coating for insulator against icing flashover

Green Intelligent Nanomaterials by Design (Using Nanoparticulate/2D-Materials Building Blocks) Current Developments and Future Trends

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